A disputed prediction-market result does not automatically get reversed. What happens depends on the market’s exact settlement rules, whether the result is still pending or already final, and the venue’s procedures. Check the contract’s wording and named information source first; then use the platform’s challenge or support channel, or escalate through the relevant regulator complaint process.
First, determine whether the market is pending or finalized
A market that has not settled yet is different from one that has already paid out. A delay alone does not show that the result is wrong: a venue may be waiting for the source named in the contract to publish or confirm data. Kalshi says determination can take from one hour to more than twelve hours after a market closes, depending on source data. Its guidance also notes that official data can be delayed or revised. See Kalshi’s settlement guidance and its explanation of why a market may remain open.
Before treating a result as an error, compare it with the contract’s exact outcome criteria, cutoff or determination date, time zone, and designated verification source. A different source may provide useful context but may not control settlement. Kalshi says its contract terms specify both the criteria and verification source; the CFTC says customers are entitled to transparent information about how settlement is determined. The CFTC’s customer advisory explains those customer-information expectations.
How the process differs by venue
| Venue | How the result is determined | What a participant can do | What the cited rules establish about finality |
|---|---|---|---|
| Polymarket | Its help page says markets are resolved by the UMA Optimistic Oracle under the market’s predefined rules. | A proposed outcome enters a two-hour challenge period. The help page describes a USDC.e bond and warns that an unsuccessful or premature proposal can forfeit the stated $750 bond. | Once resolved, winning shares receive $1 each, losing shares become worthless, and trading ends. The published process does not guarantee a successful challenge or establish that a user can reopen a finalized market. |
| Kalshi | The contract terms name the outcome criteria and verification source; determination timing depends on source data. | For an unupdated standard market after roughly twelve hours, its FAQ advises checking the rules and contacting in-app chat with the market title and relevant details. A separate Request to Settle feature asks the markets team to review a market believed ready for settlement. | The cited support guidance describes pending settlement and support requests; it does not establish Request to Settle as an appeal of a finalized result. |
| CFTC-regulated markets | The exchange’s contract terms and rules govern the market’s settlement process. | The CFTC identifies complaints to the broker, designated contract market (DCM), National Futures Association (NFA), or CFTC. Eligible matters may qualify for administrative complaint resolution through the CFTC Office of Proceedings. | The cited sources do not establish a universal appeal deadline or a right to reverse every finalized outcome. |
Polymarket’s procedures and bond amount are platform-published details, not a guarantee that a challenge will succeed. Check the live market instructions before acting because platform procedures can change. The platform describes its resolution process in its market-resolution help page and dispute guidance.
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What to do if a Polymarket result is disputed
- Read the market rules. Identify the precise resolution criterion and the source or sources the market specifies.
- Check the proposal and challenge instructions. Polymarket’s help page describes a two-hour challenge period after a proposal. Follow the current instructions shown for that market rather than assuming the same procedure applies indefinitely.
- Weigh the stated bond risk before acting. The help page says an unsuccessful or premature proposal can forfeit the full $750 bond; it does not make challenging a cost-free appeal.
- Save the evidence. Keep the market title and rules, the proposed outcome and timestamps, the relevant source publication, and any platform correspondence.
Polymarket says a proposal is backed by a USDC.e bond and that a validated proposer receives the bond plus a reward. The help page describes the challenge window and bond mechanics, but does not promise that every dispute will be reopened or resolved in a participant’s favor.
What to do if a Kalshi market is pending or appears wrong
If the market is still pending
Check the contract’s determination date, source, and rules first. Kalshi says settlement can take from one hour to more than twelve hours after closure while it waits for source data. For a standard market with no update after roughly twelve hours, its FAQ advises checking the rules and then contacting in-app chat with the market title and relevant details. Kalshi also has a Request to Settle feature for asking its markets team to review a market believed ready to settle. See Kalshi’s timing guidance, its FAQ, and the Request to Settle instructions.
If the market has finalized
Compare the outcome with the exact contract language and the source the contract names. Contact Kalshi support with the market title, the rule or criterion you believe was applied incorrectly, and relevant source evidence. The cited Request to Settle guidance concerns review of a market believed ready to settle; it does not say that the feature appeals a finalized outcome.
How to escalate a complaint about a regulated market
The CFTC’s customer guidance identifies several possible complaint channels: the broker, the DCM, the NFA, and the CFTC. The CFTC Office of Proceedings also provides administrative complaint resolution services for eligible matters. Which route applies depends on the regulated entity and the kind of dispute; eligibility is not automatic. Start with the market’s contract terms and the entity’s complaint process, and keep records of your position, the determination, and your attempts to resolve the issue.
On March 16, 2026, the CFTC published an advance notice seeking comments and information about what factors should guide DCM rules for disputes over event-contract resolution. An advance notice is not a final rule establishing a new universal appeal process. The CFTC separately reported approximately 1,600 event contracts certified for listing in 2025; that figure is a count of contracts, not disputes or settlement errors. See the CFTC customer advisory, the March 2026 advance notice, and the CFTC’s 2025 event-contract listing figure.
Evidence to keep when you challenge a result
- Save the market title and complete rules as displayed when you entered the position, including linked contract terms.
- Record the named resolution source, time zone, cutoff, determination date, and any source hierarchy or correction language.
- Compare the determination with the contract’s stated criterion and source; distinguish evidence that is relevant from evidence that the contract says controls settlement.
- Keep the outcome page, timestamps, source publication, and all challenge or support correspondence.
- Use the platform’s documented channel promptly and confirm the current instructions and deadlines for that market.
- If escalating, identify the regulated entity and check whether a broker, DCM, NFA, CFTC, or Office of Proceedings channel applies.
These records help make the issue specific: which term you believe was misapplied, what evidence supports that view, and which process you have already tried. They do not guarantee a reversal.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What a dispute does not guarantee
The procedures described by Polymarket, Kalshi, and the CFTC are venue- and matter-specific. The available guidance does not establish a universal right to appeal or undo a finalized prediction-market result. A challenge period, support request, or regulator complaint is a process for raising a concern—not proof that the original settlement will be changed.
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